<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
    <!--<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">-->
    <!--<meta name="viewport" content="initial-scale=1.0, target-densitydpi=device-dpi" />-->
    <!-- this is for mobile (Android) Chrome -->
    <!--<meta name="viewport" content="initial-scale=1.0, width=device-height">-->
    <!--  mobile Safari, FireFox, Opera Mobile  -->
    <script type="text/javascript" src="http://api.map.baidu.com/api?v=1.3">
    </script>
    <style type="text/css">
        body{font-size:13px;margin:10px}
        #container{width:800px;height:500px;border:1px solid gray}
    </style>
</head>
<body>
<div id="container"></div>
<br />
输入省、直辖市或县名称：<input type="text" id="districtName" style="width:80px" value="重庆市">
<input type="button" onclick="getBoundary()" value="获取轮廓线">

<script type="text/javascript">
    var map = new BMap.Map("container");
    map.centerAndZoom(new BMap.Point(116.403765, 39.914850), 5);
    map.addControl(new BMap.NavigationControl({type: BMAP_NAVIGATION_CONTROL_SMALL}));
    map.enableScrollWheelZoom();

    function getBoundary(){
        var bdary = new BMap.Boundary();
        var name = document.getElementById("districtName").value;
        bdary.get(name, function(rs){       //获取行政区域
            map.clearOverlays();        //清除地图覆盖物
            var count = rs.boundaries.length; //行政区域的点有多少个
            for(var i = 0; i < count; i++){
                var ply = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "#ff0000"}); //建立多边形覆盖物
                map.addOverlay(ply);  //添加覆盖物
                map.setViewport(ply.getPath());    //调整视野
            }
        });
    }

</script>
</body>
</html>